Fix manual sidecar inject doc after 0.8 template changes #1210
Description
The section referencing the sidecar-injector-configmap appears to be no longer valid for 0.8 as make installgen no longer generates the configmap's manifest.
kube-inject can also be run without access to a running Kubernetes cluster. Create local copies of the injection and mesh configmap.
kubectl create -f install/kubernetes/istio-sidecar-injector-configmap-release.yaml \
--dry-run \
-o=jsonpath='{.data.config}' > inject-config.yaml
kubectl -n istio-system get configmap istio -o=jsonpath='{.data.mesh}' > mesh-config.yaml
The configmap approach was very useful for testing with different versions of istio-proxy params and/or different istio-proxy images than what is in the installed istioctl version.